Carburetor



ZKMW 7 A J. C. FREDRICKSEN CARBURETOR Filed April 12 1920 arsen JOHN G. FREDRICKSEN, OF MILLER, INDIANA.

CARBUBETOR.

Application filed April 12, 1920. semi No. 373,458.

To all whom it may concern Be lt'liIlOWll that I, Jenn G. FREDinoKsnN, a OllllZGIlOf the United States, and a resident of the city of Miller, county of Lake,

and State of'lndiana, have invented certain new and useful Improvements in Carburetors, of which the following is a specification.

My invention relates to improvements in carburetors adapted for use in conjunction with internal combustion engines, and has for its object an improved construction of this character arranged and designed to effect a thorough and complete mixing of the fuel with air under various conditions of operation of the engine, and which is of simple construction and efiicient in operation.

Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings forming a part of this specification, and in which,

Fig. 1, is a vertical section of a carburetor embodying the invention,

Fig. 2, a horizontal section of the same taken substantially on line 22 of Fig. l, and

Fig. 3, a perspective view of the valve arrangement employed in the construction.

The preferred form of construction comprises a suitable casing 4: having a chamber 5 in the upper portion thereof, said chamber 5 being of considerable capacity and preferably of substantially the same capacity as the engine cylinders which it is to serve. The chamber 5 is provided at its lower end with a depending central tube 6 having a sleeve valve 7 slidable on the periphery thereof, and having its lower end 8 inclined, as shown. The sleeve valve 7 is connected by legs or supports 9 with a ring 10 slidable on the outer periphery of an annular hollow fuel nozzle 11, as shown. Pins 12 passing through suitable slots 12 in the wall of casing 4 serve to connect the ring 10 with the lower ends of links 13 having their upper ends connected with rocker arms 14 on a shaft 15 traversing the chamber 5. The shaft 15 is operated by means of a rod 16 connected with a rocker arm 17 thereon, whereby said shaft may be rocked to raise or depress the sleeve valve 7, as will be readily understood. The nozzle 11 is provided with a recess 16 surrounded by a fuel chamber 17, the recess 16 being of a diameter to snugly fit the exterior surface of sleeve valve 7, andthering 10 is arranged to approach and recede from the constructed portion 4 in casing 41, thus serving to act as a'throttle valve 'forthe passagefof air into and through'chambe'r 5.

A single fuel supply opening 18 is provided in the top of the nozzle 11, and a plurality of additional fuel supply openings 19 are arranged at intervals around the inner wall of the recess 16, as shown, whereby the opening 18 will remain constantly open and the openings 19 will be controlled by the sleeve valve 7 l/Vhen the sleeve valve '7 is raised to the position indicated, all of the fuel supply openings will be fully open, thus feeding a full supply of fuel to the air passing through the carburetor. As the sleeve valve 7 is depressed, the openings 19 will be gradually closed, one at a time, thus decreasing the supply of fuel and also decreasing the quantity of air passing to the chamber 5. The level of fuel in the fuel supply well 11 is maintained constant by a float chamber 20 having a float 21 therein and connected with said fuel nozzle by means of a passage 22 passing through a connecting arm 23, as shown. An air inlet 24 is also provided in the arm 23 to supply air to the annular passage surrounding the fuel nozzle 11. The chamber 5 is connected with the intake of the engine in the usual manner, and air thus drawn through the carburetor at each operation of each engine cylinder. For starting purposes, the sleeve valve 7 is depressed, cutting off all fuel. When it is desired to increase the speed of the engine, the rod 16 is manipulated to raise the sleeve valve 7, whereupon a supply of fuel is supplied to the air passing through the carburetor and additional air permitted to pass freely therethrough. It will be observed that the'air is compelled to follow a tortuous passage through the casing 4, which tends to cause thorough mixing of the fuel with said air, a result which is further augmented by the size of the chamber 5.

Preferably, a heating chamber 25 is arranged around the lower portion of chamber 5 and provided with suitable openings, as shown, whereby connection may be made with the exhaust of the engine for heating the mixture.

While I have illustrated and described the realms.

preferred form of construction for carrying.

my invention into eifect,ftliis is capable of variation i and modification Without depart ing from the spirit of the invention. 1,

therefore, do not wish to be limited to the carburetor comprising a casing having a chamber in' one end thereof; atube leading fIfQlLIll the inner end of said chamber; a sleeve valve slidably mounted on the exterior of said tube, said valve having its intweets ner end inclined; a fuel supply nozzle hav- 111 a recess receiving the lower end of said tube and of a diameter to snugly receive the extremity of said valve, the inner Wall of said recess being provided with a plurality of spaced circular openings communicating with a fuel supply, said openings being adapted to he gradually opened and closed by the movements of said valve; and means for operating said valve.

In testimony whereof I have signed my name to this specification in the presence of two subscribing, witnesses.

P JOHN C. FRE'DRICKSEN- Witnesses: a

JOSHUA R. H. Forms, 7 Rose K. TRIB. 

